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Callook.info

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United States ham radio callsigns.

Callook.info's website screenshot

About Callook.info

Callook.info is a lookup tool for U.S. amateur radio callsigns. Users enter a callsign and receive associated registration information, including geographic coordinates derived from the Bing Maps API and a grid square calculated from those coordinates.

The service provides programmatic access through an API, with output available in plain text, XML, JSON, and JSONP formats, alongside the standard web interface, a barebones view, and a browser search plugin.

Callook is intended for licensed amateur radio operators and others needing to verify or look up U.S. callsign information. It is maintained by Josh Dick (W1JDD) and accepts donations to support hosting costs.

Key features

  • U.S. amateur radio callsign lookup
  • API access with plain text, XML, JSON, and JSONP output formats
  • Browser search plugin support
  • Grid square calculation from geographic coordinates

Frequently asked questions

Is Callook.info free to use?

Yes, it is free to use, though the site accepts donations to help with hosting costs.

Who is Callook.info for?

It is for looking up U.S. amateur (ham) radio callsigns.

Does Callook.info offer an API?

Yes, it provides API access with output in plain text, XML, JSON, and JSONP formats, along with an API reference.

How accurate is the location data?

Geographic coordinates come from the Bing Maps API and the grid square is calculated from them, so coordinate and grid square accuracy is not guaranteed.

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